Great. Very good advice.
My district nurse's phone number only differs from mine by one digit, so I occasionally get her calls. If I get a 'younger' voice calling for her, I often say, "Yes, she's right beside me, I'll just wake her."
Pregnant silence, then hoots of laughter when I tell them they've got the wrong number and immediately give them the correct one.
My late Mother's number and a local taxi firm had almost identical numbers and she got loads of calls from drunks after closing time. Eventually, she started playing dispatcher, I've often laughed about the drunks standing for hours on street corners, waiting for the taxis she had "sent".